Antenna-circuit arrangement



s, m2@ w@ NL LTOU R ANTENNA C IRCUI T ARRANGEMENT Filed A1191. 19, 1921 Patented May 8,

l I 1,009,059 UNITED STATES -P;ATENTtoFE1cE-.

M ABIUS -LATOUR., OF'PABIB, FRANCE, ASSIGNOR TQ LATOUR COBIOBATION, OF JERSEY CITY, NEW JERSEY; A CQBPORATION F DELAWARE.

ANTENNALCIRCUIT ABBANGEIENT.

. Application nled August. 19, 1921, Serial No. 493,666, and in France November 11, 1915.

(GRANTED UNDER THE rnovrsrons or Tm; AcT or lanen a, 1921, 41 sTAT. L., 191s.)

Application filed `in France November 11, 1915, patented June 15, 1920, under ,502,633; France, December 8, 1915, patented March 10, 1921, under 22,826; France, Dec. 1'3, 1917,

patented April 26 1921, under 23 128; Germany, June 22, 1920; England, July 7, 1920, patented September 15, 1921, under 147,462; England, July 7 1920, patented November 7, 1921, under 164,009; Argentina, February l0 8, 1923, patented June 15, 1923, under 19,872; Argentina, February 8, 1923, patented July 14, 1923, under 20,332; Australia, November 5, 1921, patented l, November 6, 1922, under 4334/21; Canada, January 10i 1921; Belgium, June 22, 1920,' patente June 22, 1920, under 288,250; Spain, June 6, 1920, patented August 30, 1920, under 74,217; Holland, June 24, 1920; India, October 24, 1921; Norway, June 30, 1920; Poland, Aug. 8, 1920; Sweden', June 26, 1920;

Czechoslovakia, July 10, 1920.

In circuit arrangements suggested in the past for supplying current to radio telegraphic antennae with cathodic generators, the antenna-ground circuit is iniluenced in accordance with the known methods either by induction or branch connections under the control of a local oscillatory circuit associated with the generator. Y

By connecting together the two circuits, antenna-ground and the oscillatory circuit, two Wave lengths may be obtained in the antenna.

It is the object of the present invention to eliminate the phenomena whereby two waves are sent out.

In accordance with the present invention the antenna circuit is connected directly into one of the circuits of the generator, wheb a single oscillatory circuit will' be obtaineA The drawings yexemplify two circuit arrangements embodying the present invention.

Fig. 1 represents the well known circuit arrangement of `a cathodic generator. In this ligure the generator is represented by D and a current source X is connected in a branch between the plate P and a filament F. The oscillatory circuit comprisingthe inductance-L, connected in series with one winding of a transformer T and the condenser C, is inserted into the above mentioned branch circuit. The secondary windcurrent source Yka ing of the transformer is in a branch between the grid G and the f` filament. An auxiliary source Y feeds the filament. The antenna-ground circuit, not shown in the figure, is arranged to be actuated by the oscillatory circuit v LC either by, induction or by shunting.

Fig. 2, in which the same reference characters indicate the same elements as above, shows one embodiment of the invention. The oscillatory circuit'is open and the antenna A is connected to one of the terminals of the condenser C. One/end of the inductance is grounded. v

In Fig. 3 there is illustrated a circuit arrangement in which tuning 'of thel antenna circuit is effected by means of a variable inductance a portion of which is included in the antenna. In this circuit the vacuum tube D comprises a filament F heated by the grid G and a plate P. A current source is connected in a branch circuit between the plate P and the ilament F. The inductance L forms lpart of the antenna circuit AH `without the insertion of the capacity C of Fig. 1. Instead of using a transformer Tthe grid G is vconnected to a winding T connected and coupled with the inductance L.

` In order to change the length of the wave sent out, it is necessary in such a system to modify-the number of turns in L. On the other hand, in order to obtain maximum power from the generator, it is also necessary to modify the number of turns in T depending upon the length of the wave. WVhen the number of turns in L is reduced, the number of turns in T must be increased and vice versa.

As'shown in Fig. 3 this result may be obtained in response to a single operation. In this arrangement, waves of different lengths are sent depending upon the position of the sliding contact K which divides the total inductance LT in sections of the desired values.

Fig. 3 also shows a mani ulator or interrupting key I for controlling the sending of signals. This interrupter is arranged in a manner to open the grid and plate circuits simultaneously, the generator circuits being established only when the sending of the waves is desired. As a matter of fact this has proved to be satisfactory by experience,

and particularly in the case of tubes having a fine grid. yIn order to avoid possible disthat the Generator is left under continuous tension. n reality it is sutiicient that the grid and plate circuit are simultaneously closed. lt this is done, each element performs its normal function and this will happen it' the interrupter is situated in the -manner shown in Fig. 3.

' The source X which may obviously be an alternating current source in any of the arrangements according to my invention may also be permanently connected with a resistance in order toA avoid too high initial potentials in the plate-filament circuit when the interrupter is closed.

rlhe connections between the antenna and ground or the counterpoise may be reversed.

k'lhat arrangement should be adopted whichj makes possible the elimination ot the harmful capacity e'ects, and the interrupter may beconnected in the antenna circuit.

should have a ln all cases the relation C Y suitable'value so that the maximum power connected with tie generator circuit and producin a new circuit in the local system, 1n accor ance .with the present invention, one of the elements already existing in the local system performs this service, whereby the induction of a new element is obvia-ted.

In the light f this delinition, various arrangements different from those specifically described may be devised;

Although particularly described with reference to a transmitting system the invention is also applicable to Wireless telephone and telegraph receiving circuits with circuits similar to those described and with the addition of indicating circuits connected in various known ways.

It is advisable to adjust the regenerative condition so as to obtain the maximum sensitiveness of the three-electrode audion tube used as a cathodic relay.`

As above stated, identically the same apparatus as described for transmission may be connected With receiving circuits, and the system will be put in an operative condition close to the adjustment Where the valves start to generate oscillations.

In order to regulate the sensitiveness, the hea-ting of lthe filament or the potential between the grid and the lament is controlled.

rlhe receiving circuit proper will extend between any two points of the system thus constituted, e. g., between the grid and the fila I ent of the generator. Any detector, but preterably an audion tube, may be used in this receiving circuit. l

The two embodiments shown in Figs. 2 and 3 ot the drawings are only for the purposo otlillustiiating the invention, and it should be understood that the various elcnients may be modified or resistances, capacities, or inductances may be added to the circuits Without departing from the spirit of the invention.

Having described my invention what l claim is:

l. ln a radio signalling system, the combination ot' an antenna, a three electrode valve having a heated ilament, a grid and a plate, a source of electromotive force between the plate and filament, an inductance between the plate and the filament, said inductance being also in the antenna, and an inductance connected to the grid and to said plate inductance, said plate inductance and antenna capacity being adapted tol act as an oscillation circuit common to the plate and antenna circuits, saidoscillation circuit being the only physically tuned circuit in the system.

2. In a radio signalling system, the combination of a grounded antenna, a three electrode valve having a heated grounded lainent, a `grid and a plate, a plate circuit containing a source of electromotivc force and an inductance connected to the plate and the antenna at one end, to the grid at the other end and to ground at an intermediate point by means 'ot an adjustable connection.

3. In a radio signalling system, the combination 'ot a grounded antenna, a three electrode valve having a heated grounded ilament, a grid and a plate, a plate circuit containing Aa source of electromotive force and an inductance connectcd to the plate and the antenna at one end, to the grid at the other end and to round at an intermediate point by means ot an adjustable connection, and means for simultaneously interruptin f the circuit between the ilameiit and grid and between the `filament and plate.

a. ln a radio frequency arrangement, an electron discharge device having an anode, cathode and control electrode, a tuned antenna circuit, means for regencratively couplingthc input and output circuits ot said device together, and means for coupling said device to said antenna circuit, 'whereby said antenna,` circuit is'the only physically tuned circuit in the arrangement.

5. In a radio frequency arrangement, an electron discharge device having an anode, cathode and control electrode, a tuned antenna circuit, means for coupling the input and output circuits ofsaid device together to produce oscillationsfand means for coupling said device Ato said antenna circuit, whereby said antenna circuit is kthe only physically tuned circuit in the arrangement.

6. `In a radio frequency arrangement,^an electron discharge device having an anode, -athode and control electrode, a Source of space current, a source of cathode heating current, kone ot' said currents being alternating, a tuned antenna circuit, means for regeneratively coupling the input and output circuits of said device together, and means for coupling said device to said antenna circuit, whereby said antenna circuit is the only physically tuned circuit in the arrangement.

7. In a radio frequency arrangement, anJ electron discharge device having an anode, cathode and control electrode, a sourceof alternating space current', a tuned antenna circuit, means for regeneratively coupling the input and output circuits of said device together, and means rfor coupling said device to said antennav circuit, whereby said antenna. circuit is the only physically tuned circuit in the arrangement.

8. In a system of the class described, an electron discharge device having an anode, cathode and control electrode, an input circuit including said cathode and control electrode and an output circuit including said controlling the trains of oscillations comrising a permanent conductive connection ietween the control element of the valve and the negative lead of the high tension supply and a circuit interrupting device interposed in a conductor connecting the said negative lead and the filament of the valve.

MARIUS LATOUR. 

